msm: sde: disallow partial writes on rotator wb

Configure the MDSS to only issue full writes on the rotator
writeback for non-UBWC formats. This is to prevent any
spurious reads from being generated by partial write attempts.

CRs-Fixed: 2048700
Change-Id: Ib39d9f9c070d2fb02fe6b69f9fbfcce4a7d7e160
Signed-off-by: Clarence Ip <cip@codeaurora.org>